From: An augmented Lagrangian method for the Signorini boundary value problem with BEM
N = 40
N = 80
N = 160
N = 320
N = 640
ρ = 100
9
10
12
ρ = 101
6
7
8
ρ = 102
5
ρ = 103
4
ρ = 104
3
ρ = 105